Research on Arc Extinguishing Characteristics of DC Molded Case Circuit Breaker Based on Arc Voltage

doi:10.16628/j.cnki.2095-8188.2026.06.008

Abstract

Abstract:

The short-circuit arc extinguishing conditions of low-voltage DC molded case circuit breakers remain unclear, and no quantitative evaluation criterion is available for the breaking performance of products equipped with different arc extinguishing chamber structures. To solve this problem, an evaluation method for short-circuit breaking performance of DC molded case circuit breakers based on arc voltage is proposed. Different target arc voltages are obtained by adjusting the quantity of arc plates inside the arc extinguishing chamber. It systematically studies the influence of average arc voltage on the arc extinguishing performance of circuit breakers under three test conditions: 1 500 V/5 kA, 750 V/20 kA and 750 V/10 kA. Test results indicate that the critical average arc voltage coefficients for reliable arc extinction under the three working conditions are 0.45, 1.13 and 0.89, and the corresponding required numbers of arc plates for the arc extinguishing chamber are 30, 34 and 30 respectively. The research conclusions can offer theoretical guidance for the design and optimization of arc extinguishing chambers of low-voltage DC molded case circuit breakers, and support rapid screening of the optimal matching scheme for arc extinguishing chamber layout.

Key words: DC molded case circuit breaker, short-circuit breaking, arc extinction condition, arc voltage

CLC Number:

TM56

ZHANG Senlin, ZHANG Yihe, WANG Bingqing. Research on Arc Extinguishing Characteristics of DC Molded Case Circuit Breaker Based on Arc Voltage[J]. LOW VOLTAGE APPARATUS, 2026, 0(6): 67-75.

Figures/Tables 18

样机序号	试验结果	灭弧室编号	通断时间T_break/ms	开断能量I²t/(kA²·s)	燃弧时间T_arc/ms	K_5.0	K_7.5	K_10.0
1	开断成功	③	25.820	1 528.50	19.036	0.79	0.81	0.85
2	开断失败	③	47.127	1 554.60	42.354	0.77	0.86	0.92
3	开断失败	③	40.562	1 937.30	34.200	0.84	0.83	0.84
4	开断成功	③	25.223	1 026.60	20.604	1.07	1.09	1.08
5	开断成功	③	23.681	946.83	20.895	1.14	1.08	1.09
6	开断失败	③	43.399	832.85	34.765	1.14	1.13	1.13
7	开断成功	④	27.428	1 511.30	20.644	1.00	1.04	1.09
8	开断成功	④	22.702	881.08	20.978	1.14	1.07	1.13
9	开断成功	④	21.600	1 239.90	16.999	1.10	1.17	1.18
10	开断成功	④	20.267	852.70	15.947	1.12	1.17	1.21
11	开断成功	④	19.750	916.00	15.238	1.00	1.11	1.21
12	开断成功	④	20.266	852.73	15.802	1.12	1.17	1.21
13	开断成功	④	19.747	916.00	15.278	1.00	1.11	1.21
14	开断成功	④	19.839	757.44	15.499	1.32	1.26	1.27
15	开断成功	④	19.836	757.44	15.538	1.25	1.26	1.27
16	开断成功	⑤	18.531	1 028.60	12.255	1.16	1.32	1.36
17	开断成功	⑤	20.578	943.67	14.311	1.36	1.39	1.36
18	开断成功	⑤	19.477	1 125.50	14.250	1.33	1.38	1.38
19	开断成功	⑤	19.715	1 498.90	13.000	1.11	1.34	1.40
20	开断成功	⑤	18.403	1 265.90	11.878	1.21	1.35	1.40
21	开断成功	⑤	20.692	1 439.30	11.874	1.31	1.43	1.47
22	开断成功	⑤	18.752	1 288.70	11.549	1.04	1.50	1.52
23	开断成功	⑤	16.415	905.36	11.572	1.45	1.58	1.58
24	开断成功	⑥	15.639	914.00	9.630	1.50	1.56	1.56
25	开断成功	⑥	19.177	1 182.10	10.484	1.66	1.60	1.60
26	开断成功	⑥	16.955	1 132.60	10.568	1.65	1.68	1.68
27	开断成功	⑥	16.981	1 279.10	10.035	1.29	1.69	1.77
28	开断成功	⑥	17.664	1 198.90	8.913	1.78	1.83	1.83
29	开断失败	⑥	59.871	1 710.30	55.520	2.08	1.95	1.84
30	开断成功	⑥	15.590	1 046.20	10.541	1.87	1.87	1.87
31	开断成功	⑥	15.203	936.39	8.900	1.92	1.92	1.92

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试验编号	开断成功次数	开断失败次数	通断时间/ms		开断能量/(kA²·s)		燃弧时间/ms
试验编号	开断成功次数	开断失败次数	上限	下限	上限	下限	上限	下限
A	13	2	79.762	30.662	568.80	273.58	70.583	21.781
B	27	4	59.871	15.203	1 937.31	832.85	42.354	8.993
C	2	1	169.298	18.299	621.65	481.70	165.320	13.716

样机序号	试验结果	灭弧室编号	通断时间T_break/ms	开断能量I²t/(kA²·s)	燃弧时间T_arc/ms	K_5.0	K_7.5	K_10.0
1	开断失败	①	73.983	568.80	65.111	0.32	0.35	0.38
2	开断失败	①	79.762	441.49	70.583	0.24	0.36	0.40
3	开断成功	①	65.635	468.83	53.575	0.29	0.37	0.41
4	开断成功	②	40.333	340.43	31.172	0.29	0.37	0.45
5	开断成功	②	38.979	287.72	28.523	0.31	0.40	0.46
6	开断成功	②	49.259	342.64	39.726	0.35	0.42	0.47
7	开断成功	②	41.158	401.12	28.188	0.35	0.42	0.47
8	开断成功	③	37.276	320.90	25.958	0.36	0.45	0.51
9	开断成功	③	30.850	276.26	21.880	0.38	0.46	0.53
10	开断成功	③	57.810	438.18	48.757	0.39	0.45	0.49
11	开断成功	③	32.316	277.57	21.781	0.39	0.48	0.53
12	开断成功	④	35.812	341.78	24.914	0.44	0.49	0.53
13	开断成功	④	30.662	273.58	21.985	0.42	0.52	0.57
14	开断成功	④	49.284	369.70	36.799	0.39	0.48	0.55
15	开断成功	④	35.693	359.76	23.696	0.34	0.55	0.67

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